US4378339A - Ammonium thiosulfate products and methods of making the same - Google Patents
Ammonium thiosulfate products and methods of making the same Download PDFInfo
- Publication number
- US4378339A US4378339A US06/045,658 US4565879A US4378339A US 4378339 A US4378339 A US 4378339A US 4565879 A US4565879 A US 4565879A US 4378339 A US4378339 A US 4378339A
- Authority
- US
- United States
- Prior art keywords
- ammonium thiosulfate
- product
- solution
- water
- making
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 6
- 230000009969 flowable effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 1
- 238000000354 decomposition reaction Methods 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/64—Thiosulfates; Dithionites; Polythionates
Definitions
- This invention relates to ammonium thiosulfate products and methods of making the same and particularly to a stable ammonium thiosulfate product of high concentration which will not break down in storage, has high flowability characteristics and can be shipped and packaged without breakdown.
- Ammonium thiosulfate is shipped and stored, at the present time, almost exclusively in the form of a water solution containing from 57 percent to 60 percent by weight of anhydrous ammonium thiosulfate, (NH 4 ) 2 S 2 O 3 . It has been found necessary to ship and store ammonium thiosulfate in water solution at about 57% to 60% by weight of anhydrous ammonium thiosulfate because the ammonium thiosulfate in the anhydrous condition decomposes spontaneously, yielding various decomposition products of which elemental sulfur is the most objectionable.
- Ingraham U.S. Pat. No. 3,345,131 provides a method of making an anhydrous ammonium thiosulfate product which is highly resistant to decomposition. While this is a very satisfactory method, it involves compressing the crystals into briquettes which introduces added expense and produces a very dense product. Attempts to reduce the amount of water by concentration of the solution beyond 60% have apparently not been attempted because precipitation of crystals occurs at this point and this precipitated product has not been considered acceptable.
- the product of this invention has the general characteristics of solid anhydrous ammonium thiosulfate yet retains the stability of a solution of ammonium thiosulfate.
- the pH of the product must be maintained in the pH range 8 to 10 and preferably about pH 9. We have found that there must be present sufficient solution water in the product to form a slight aqueous film on the crystals.
- the product can be shipped in polyethylene plastic bags, or lined drums exactly like a solid chemical product which it resembles.
- ammonium thiosulfate product i.e. simply add water to bring it to the desired concentration.
- any of the usual additives incorporated into ammonium thiosulfate may be incorporated with this product with no change in the character of the result.
- the product of this invention may be made by adding sufficient fresh non-decomposed anhydrous ammonium thiosulfate to a 60% solution of ammonium thiosulfate to produce a concentration of about 80% to 90%.
- the product may be made by vacuum concentration of a 60% solution to obtain a product having a concentration of about 80% to 90% anhydrous ammonium thiosulfate.
- Example 1 One liter of a 60% solution of anhydrous ammonium thiosulfation was admixed with sufficient fresh anhydrous ammonium thiosulfate to provide a solution of 85% anhydrous ammonium thiosulfate.
- the finished product had a damp feel on touch, was readily flowable and could be poured from one container to another like a crystalline product. Again the product was stored in a polyethylene bag for six months and tested with precisely the same results as the product of Example 1.
- a product was prepared according to Example 2 to provide increments of 0.5% from 80% to 90% anhydrous ammonium thiosulfate with results similar to those of Example 2.
Abstract
Description
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/045,658 US4378339A (en) | 1979-06-05 | 1979-06-05 | Ammonium thiosulfate products and methods of making the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/045,658 US4378339A (en) | 1979-06-05 | 1979-06-05 | Ammonium thiosulfate products and methods of making the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US4378339A true US4378339A (en) | 1983-03-29 |
Family
ID=21939192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/045,658 Expired - Lifetime US4378339A (en) | 1979-06-05 | 1979-06-05 | Ammonium thiosulfate products and methods of making the same |
Country Status (1)
Country | Link |
---|---|
US (1) | US4378339A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5618658A (en) * | 1995-02-22 | 1997-04-08 | Fuji Hunt Photographic Chemicals, Inc. | Process for producing an ammonium thiosulfate product |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2412607A (en) * | 1943-10-21 | 1946-12-17 | Mallinckrodt Chemical Works | Ammonium thiosulfate |
US3345131A (en) * | 1964-05-05 | 1967-10-03 | Heico Inc | Methods of preventing decomposition of anhydrous ammonium thiosulfate |
DE2635649A1 (en) * | 1976-08-07 | 1978-02-09 | Hoechst Ag | PROCESS FOR PRODUCING AMMONIUM THIOSULPHATE |
-
1979
- 1979-06-05 US US06/045,658 patent/US4378339A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2412607A (en) * | 1943-10-21 | 1946-12-17 | Mallinckrodt Chemical Works | Ammonium thiosulfate |
US3345131A (en) * | 1964-05-05 | 1967-10-03 | Heico Inc | Methods of preventing decomposition of anhydrous ammonium thiosulfate |
DE2635649A1 (en) * | 1976-08-07 | 1978-02-09 | Hoechst Ag | PROCESS FOR PRODUCING AMMONIUM THIOSULPHATE |
Non-Patent Citations (1)
Title |
---|
Mueller, "Chem. Abstracts", vol. 62, 1965, 8713d. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5618658A (en) * | 1995-02-22 | 1997-04-08 | Fuji Hunt Photographic Chemicals, Inc. | Process for producing an ammonium thiosulfate product |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, A CORP. OF DE. Free format text: MERGER;ASSIGNOR:WHITTAKER CORPORATION, A CORP. OF CA.;REEL/FRAME:005261/0367 Effective date: 19861001 Owner name: WHITTAKER CORPORATION, A CORP. OF CA., CALIFORNIA Free format text: MERGER;ASSIGNOR:TASKER INDUSTRIES, A CORP. OF CA.;REEL/FRAME:005267/0361 Effective date: 19721028 |
|
AS | Assignment |
Owner name: CASCHEM, INC., A CORP. OF DE, NEW JERSEY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WHITTAKER CORPORATION;REEL/FRAME:005130/0435 Effective date: 19890605 |
|
AS | Assignment |
Owner name: SECURITY PACIFIC NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:WHITTAKER CORPORATION;REEL/FRAME:005311/0926 Effective date: 19890628 |
|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, A CORP. OF DE, DELAWARE Free format text: MERGER;ASSIGNOR:WHITTAKER CORPORATION, A CORP. OF CA;REEL/FRAME:005268/0473 Effective date: 19861031 |
|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, CALIFORNIA Free format text: RELEASE OF LIEN;ASSIGNOR:SECURITY PACIFIC NATIONAL BANK;REEL/FRAME:007815/0366 Effective date: 19900605 |
|
AS | Assignment |
Owner name: RUTHERFORD CHEMICALS LLC, NEW JERSEY Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:THE CIT GROUP/BUSINESS CREDIT, INC.;REEL/FRAME:017240/0432 Effective date: 20060206 |